A085569 - cp's OEIS frontend

A085569 Denominator of 2Sum(C(n,w)/(2w+1),w=0..n/2-1)+C(n,n/2)/(n+1) if n is even, or of 2Sum(C(n,w)/(2w+1),w=0..(n-1)/2) if n is odd.

n	a(n)
0	1
1	1
2	3
3	1
4	15
5	3
6	7
7	15
8	45
9	5
10	231
11	21
12	455
13	315
14	45
15	3
16	1683
17	3465
18	7315
19	5005
20	3003
21	143
22	13455
23	585
24	6825
25	13923
26	3213
27	6545
28	515185
29	17765
30	110143
31	31977
32	2078505
33	62985
34	1789515
35	51129
36	210197
37	426075
38	246675
39	6325
40	1400355
41	34155
42	41612175
43	84192075

[1, 1, 3, 1, 15, 3, 7, 15, 45, 5, 231, 21, 455, 315, 45, 3, 1683, 3465, 7315, 5005, 3003, 143, 13455, 585, 6825, 13923, 3213, 6545, 515185, 17765, 110143, 31977, 2078505, 62985, 1789515, 51129, 210197, 426075, 246675, 6325, 1400355, 34155, 41612175, 84192075]

cp's OEIS Frontend

A085569 Denominator of 2Sum(C(n,w)/(2w+1),w=0..n/2-1)+C(n,n/2)/(n+1) if n is even, or of 2Sum(C(n,w)/(2w+1),w=0..(n-1)/2) if n is odd.

Table of values

List of values

cp's OEIS Frontend

A085569 Denominator of 2*Sum(C(n,w)/(2*w+1),w=0..n/2-1)+C(n,n/2)/(n+1) if n is even, or of 2*Sum(C(n,w)/(2*w+1),w=0..(n-1)/2) if n is odd.

Table of values

List of values

A085569 Denominator of 2Sum(C(n,w)/(2w+1),w=0..n/2-1)+C(n,n/2)/(n+1) if n is even, or of 2Sum(C(n,w)/(2w+1),w=0..(n-1)/2) if n is odd.